초록 열기/닫기 버튼
Energy performance of building envelope components, including external walls, floors, roofs, windows anddoors, is crutial for determining how much energy is required for heating and cooling in a building. Among variousbuilding technologies, a green roof system can be a good option for reducing heat gain and loss in new buildings aswell as existing buildings for green remodeling. This paper evaluates the performance of green roof systems accordingto soil depth and Leaf Area Index (LAI) for existing buildings. It also attempts to quantify the energy saving effectson new and existing buildings with different insulation levels. Thermal performance of green roofs is mainly dependenton soil thickness and LAI. Installation of green roofs in deteriorated existing buildings can lead to improvements inroof insulation, due to the soil layer. An increase in soil depth leads to a decrease in heating load, regardless ofconditions of vegetation on the green roof. Larger LAI values may reduce cooling loads in the cooling season. Installationof green roof in deteriorated existing buildings showed bigger energy saving effect in comparison to a case innew buildings. A simulation study showed that the installation of green roof systems in deteriorated existing buildingswith low insulation levels, due to low thermal performance requirements when constructed, could improve the energyperformance of the buildings similar or better to the peformance on new buildings with the most updated insulationstandard. Thus, when remodeling a deteriorated building, green roofs could be a good option to meet the most recentenergy requirements.
